Butane is a bastard fuel.
This bomb doesnt make sense to me. It appears to me that the bombs werent meant to explode. A gas cylinder would have to be penetrated in some way to cause an explosion.
If the gas in the cylinder had been meant to explode it would still have been designed to leak out some way. The gas cylinder couldnt be full and meant to explode unless a charge was placed beside it to penetrate it. If it was penetrated or leaking it wasnt full. Their explanation dosnt make sense to me, But then I am no bomb expert.
Butane is a bastard fuel.
Two-ssstage bomb, probably. The butane tank explodes because of expansion of the butane from the heat from the initial explosion.